I'm not sure what you could be referring to for "real world testing". There are so many variables involved in the real world that it's almost impossible to duplicate real world conditions. In order to truely compare, you'd have to have both follow exactly the same path at the same time for weeks on end. The usage would have to be based on the actual recorded driving routes and speeds.
I just got 51.1 MPG over 451 miles in a 2002 Prius. Much of that was freeway driving with 4 passengers. That's real world, but I have no idea what a 2002 Civic would have done on the same course in the same traffic with the same load.
As for inefficient...... Compared to what? I don't know of any cars that currently do 0 to 60 in 4 seconds and give better than 20 mpg.
Daniel